<template>
	<transition name="slide">
		<div class="user-center">
			<div class="back" @click="back">
				<i class="icon-back"></i>
			</div>
			<div class="switches-wrapper">
				<switches 
					:switches="switches" 
					:currentIndex="currentIndex"
					@switch="switchItem"
					></switches>
			</div>
			<div class="play-btn" ref="playBtn" @click="random">
				<i class="icon-play"></i>
				<span class="text">随机播放全部</span>
			</div>
			<div class="list-wrapper" ref="listWrapper">
				<scroll 
					ref="favoriteList" 
					class="list-scroll" 
					v-if="currentIndex === 0" 
					:data="favoriteList">
						<div class="list-inner">
							<song-list :songs="favoriteList" @select="selectSong"></song-list>
						</div>
					</scroll>
					<scroll 
					ref="playList" 
					class="list-scroll" 
					v-if="currentIndex===1" 
					:data="playHistory">
						<div class="list-inner">
							<song-list :songs="playHistory" @select="selectSong"></song-list>
						</div>
					</scroll>
			</div>
			<div class="no-result-wrapper" v-show="noResult">
				<no-result :title="noResultDesc"></no-result>
			</div>
		</div>
	</transition>
</template>

<script>
	import Switches from "@/base/switches/switches"
	import Scroll from '@/base/scroll/scroll'
	import SongList from '@/base/song-list/song-list'
	import Song from '@/common/js/song'
	import NoResult from '@/base/no-result/no-reslut'
	import { mapGetters, mapActions } from 'vuex'
	import { playlistMixin } from '@/common/js/mixin'
	export default {
		mixins: [playlistMixin],
		data() {
			return {
				currentIndex: 0,
				switches: [
					{name: '我喜欢的'},
					{name: '最近听的'}
				]
			}
		},
		computed: {
			noResult() {
				// 如果播放歌曲列表为零的话就展示
				if (this.currentIndex === 0) {
					return !this.favoriteList.length
				} else {
					return  !this.playHistory.length
				}
			},
			noResultDesc() {
				// 如果播放歌曲列表为零的话就展示
				if (this.currentIndex === 0) {
					return '暂无收藏歌曲'
				} else {
					return  '你还没有听过歌曲'
				}
			},
			...mapGetters([
				'favoriteList',
				'playHistory'
			])
		},
		methods: {
			handlePlaylist(playlist) {
				// 拿到bottom
				const bottom = playlist.length > 0 ? '60px' : ''
				this.$refs.listWrapper.style.bottom = bottom
				this.$refs.favoriteList && this.$refs.favoriteList.refresh()
				this.$refs.playList && this.$refs.playList.refresh()
			},
			switchItem(index) {
				this.currentIndex = index
			},
			selectSong(song) {
				this.insterSong(new Song(song))
			},
			back() {
				this.$router.back()
			},
			// 随机播放
			random() {
				let list = this.currentIndex === 0 ? this.favoriteList : this.playHistory
				// 对list进行封装
				list = list.map((song) => {
					return new Song(song)
				})
				this.randomPlay({
					list
				})
			},
			...mapActions([
				'insterSong',
				'randomPlay'
			])
		},
		components: {
			Switches,
			Scroll,
			SongList,
			NoResult
		}
	}
</script>

<style lang="stylus" scoped>
	@import "~common/stylus/variable"
	.user-center
		position: fixed
		top: 0
		bottom: 0
		z-index: 100
		width: 100%
		background: $color-background
		&.slide-enter-active, &.slide-leave-active
			transition: all 0.3s
		&.slide-enter, &.slide-leave-to
			transform: translate3d(100%, 0, 0)
		.back
			position absolute
			top: 0
			left: 6px
			z-index: 50
			.icon-back
				display: block
				padding: 10px
				font-size: $font-size-large-x
				color: $color-theme
		.switches-wrapper
			margin: 10px 0 30px 0
		.play-btn
			box-sizing: border-box
			width: 135px
			padding: 7px 0
			margin: 0 auto
			text-align: center
			border: 1px solid  $color-text-l
			color: $color-text-l
			border-radius: 100px
			font-size: 0
			.icon-play
				display: inline-block
				vertical-align: middle
				margin-right: 6px
				font-size: $font-size-medium-x
			.text
				display: inline-block
				vertical-align: middle
				font-size: $font-size-small
		.list-wrapper
			position: absolute
			top: 110px
			bottom: 0
			width: 100%
			.list-scroll
				height: 100%
				overflow: hidden
				.list-inner
					padding: 20px 30px
		.no-result-wrapper
			position: absolute
			width: 100%
			top: 50%
			transform: translateY(-50%)
</style>